Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467a650fd1447ac…

MALICIOUS

PDF

93.8 KB Created: 2021-08-03 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2b716d83935f67eef828de02a9b5c26 SHA-1: 1dda0cdbe279e65335e21fc64de4c5c0bcaaaea2 SHA-256: 6467a650fd1447ace7730115a1cd787251ec5225f0caf33fa577c2d37943dacc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alate.org/admin/fckeditor/editorfile/ribizo.pdf In PDF document text
    • http://70sromans.com/clients/871711/File/vaken.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/55306048019.pdfIn PDF document text
    • https://ubranni.com/uploader/files/46160263229.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pk63oel242m7fcoo7omubc7a7c/jisaji.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081941bca09a---76217514549.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/monevodutipefifigolarevu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf13a5a14e1---jiruxuzoxawinugawowuzeg.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/valevofexoxewafigotuj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/84516428594.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f6244e9cf---53456549505.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6cc753eb2---pajiruduwe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f06701e55---36009427395.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/futetejimoginajavud.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a1fcaqse2jd5g8j5lrbjt61fp5/5338365071.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b4d2f6d3---33144168748.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mj5asum6uibte2c2un9rd24vvi/6101397989.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/96kfj851orlb02pphual8ib3s7/zelej.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/vunedovetugijifobapigux.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/85350744977.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/guriwubunug.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/keselot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=yin+yoga+sequence+for+the+crown+chakraPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17252 bytes
SHA-256: 628fb031147c1fed8b212ef00dda53935bfbf1355c96265241a6b478dc24151d
font_01_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 16336 bytes
SHA-256: 4e5d5571aba6479fad95836336c4da80d72cdf867e940f50cce122438649b72d
font_03_sfnt_off00014d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7C 11092 bytes
SHA-256: eba3ba151dfb7cfddd0b5a4f2596d44824d12819e423066c2c202fa7970288c7

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